An exchange fund is a private pooled investment vehicle that lets an investor contribute a single appreciated stock in exchange for a proportional slice of a diversified basket, deferring the capital gains tax an outright sale would trigger, in exchange for a lockup of roughly seven years.
In plain terms
Trade one stock for a fraction of many stocks without a sale changing hands. An investor holding a large block of a single company’s shares contributes those shares to the fund’s pool alongside shares other investors contribute, and receives back a partnership interest representing a proportional claim on the whole mixed basket. No cash changes hands, no gain is reported, and the investor goes from “all one company” to “a sliver of a few hundred.” The price is time: the interest is generally illiquid for around seven years.
How it works
The mechanism rests on U.S. partnership tax law, specifically 26 U.S.C. § 721, which lets a partner contribute property to a partnership without recognizing gain. Section 721(b) withdraws that protection if the partnership “would be treated as an investment company” under the test 26 U.S.C. § 351 uses — broadly, a company holding more than 80% of its value in marketable securities. To stay under that line, an exchange fund keeps at least a fifth of its assets in other, generally illiquid, investments — in practice usually leveraged real estate, often financed with borrowed money rather than investor cash.
Each contributor’s partnership interest carries over the low cost basis of the stock contributed; nothing about the structure forgives the gain, it only postpones the point at which it is recognized. Redeeming or transferring an interest within roughly seven years of contribution can trigger the built-in gain under the partnership mixing-bowl rules, so funds and investors alike treat the lockup as fixed. After it runs, an investor typically exits with a pro-rata slice of the fund’s diversified holdings rather than cash, still carrying the original low basis.
Access has historically run through the private-fund exemptions: most exchange funds are organized so they need not register as investment companies, and participation is commonly restricted to qualified purchasers or accredited investors. Newer entrants have pushed minimums down from the historical multimillion-dollar floor to around $100,000 as of 2026, extending the product toward equity-rich employees rather than only family offices.
The numbers
- Illiquid-asset floor: at least 20% of fund assets in non-securities, typically leveraged real estate, to avoid investment-company status.
- Lockup: roughly seven years, tracking the partnership built-in-gain recognition period.
- Typical newer-provider minimum: about $100,000, as of 2026 — down from a historical multimillion-dollar floor.
- Tax effect at exit: the contributed stock’s original cost basis carries over; the deferred gain is unrecognized, not eliminated.
What people get wrong
That an exchange fund erases the tax bill on a concentrated stock. It doesn’t: the low basis simply moves with the investor into the diversified interest, and the gain resurfaces in full if that interest is ever sold during life — only a step-up in basis at death actually erases it, the same as it would for the original stock. The other overlooked cost is the illiquid sleeve itself: the real-estate allocation required to satisfy the 80% test is often leveraged and fee-laden, so part of what looks like “diversification” is really a second, less liquid concentrated bet layered under the fund’s own borrowing.
Related
Read more: Liquidity: How Much Cash the Wealthy Actually Keep · Alternative Assets: Investing Beyond Stocks and Bonds
See also: Concentrated position · Qualified purchaser · Accredited investor